Hi
Id like to ask for help.
When i connect my arduino board to Pduino-0.4beta2 i am getting constantly nois when i turn on analog inlets.
I have connect nothing to pins and values in pduino are still shaking.
Id like to try use maxSonar for my instalation but is not useble in such condition.
pleas can u somehow help me
thanx
Do you have anything wired up to the analog inputs? If they are just floating free it is normal to see some noise from them.
I have a trending program running (liberlab) on my PC scanning 4 analog inputs from the Arduino and they show some noise, and if I touch the traces going to the pins with a finger I can make the trends go full scale.
However if I ground them or have pull down resistors installed the values flat-line nice and clean.
Lefty
i had nothing connected,
i try ground pin and shows absolut 0 right
then i try connect petentiometer and it shoved me also some nois.
finaly i found on MaxSonar web this:
How can I get the best possible accuracy from the analog voltage output?
First, many users have reported that this is the interface of choice for them. In addition, from these users we have heard that the analog voltage output agrees with the other outputs. This is true for most users because the MaxSonar®-EZ1? sets this voltage to within 5 mV, twice the accuracy required.
But if in your application the MaxSonar®-EZ1? analog voltage output has noise, there is an easy way to remove the noise on the analog voltage output. Place a 0.1uF capacitor near/at your analog to digital pin directly to your ground. Next place a 10K ohm resistor in series with the analog voltage output from the MaxSonar®-EZ1? to the 0.1uF capacitor. The time constant for this circuit will be 1mS. This will cause a 5mS delay to allow the voltage to settle. For slower readings and slightly less noise the resistor can be increased to 100K ohms and this will cause a 50mS delay. (If you are technical please read the sections following this answer for the reasons why this might be needed.)
http://www.maxbotix.com/MaxSonar-EZ1__FAQ.html
Hi dxtr, you have drawn the capacitor between the grounds. The text says that capacitor should go from the arduino analog input to ground and the resistor should be connected between the sensor output and the arduino input .
thanks 